The gain margin of a unity feedback control system with the open loop transfer function (mathrm{G}(s)=frac{s+1}{s^{2}}) is
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The gain margin of a unity feedback control system with the open loop transfer function \(\mathrm{G}(s)=\frac{s+1}{s^{2}}\) is
(a) 0
(b) \(1 / \sqrt{2}\)
(c) \(\sqrt{2}\)
(d) \(\infty\)
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